drivers/staging/hv/ChannelMgmt.c

   1 /*
   2  *
   3  * Copyright (c) 2009, Microsoft Corporation.
   4  *
   5  * This program is free software; you can redistribute it and/or modify it
   6  * under the terms and conditions of the GNU General Public License,
   7  * version 2, as published by the Free Software Foundation.
   8  *
   9  * This program is distributed in the hope it will be useful, but WITHOUT
  10  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  11  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
  12  * more details.
  13  *
  14  * You should have received a copy of the GNU General Public License along with
  15  * this program; if not, write to the Free Software Foundation, Inc., 59 Temple
  16  * Place - Suite 330, Boston, MA 02111-1307 USA.
  17  *
  18  * Authors:
  19  *   Haiyang Zhang <haiyangz@microsoft.com>
  20  *   Hank Janssen  <hjanssen@microsoft.com>
  21  *
  22  */
  23
  24
  25 #include <linux/kernel.h>
  26 #include <linux/mm.h>
  27 #include "osd.h"
  28 #include "include/logging.h"
  29
  30 #include "VmbusPrivate.h"
  31
  32 /* Data types */
  33
  34 typedef void (*PFN_CHANNEL_MESSAGE_HANDLER)(VMBUS_CHANNEL_MESSAGE_HEADER* msg);
  35
  36 typedef struct _VMBUS_CHANNEL_MESSAGE_TABLE_ENTRY {
  37         VMBUS_CHANNEL_MESSAGE_TYPE      messageType;
  38         PFN_CHANNEL_MESSAGE_HANDLER messageHandler;
  39 } VMBUS_CHANNEL_MESSAGE_TABLE_ENTRY;
  40
  41 /* Internal routines */
  42
  43 static void
  44 VmbusChannelOnOffer(
  45         PVMBUS_CHANNEL_MESSAGE_HEADER hdr
  46         );
  47 static void
  48 VmbusChannelOnOpenResult(
  49         PVMBUS_CHANNEL_MESSAGE_HEADER hdr
  50         );
  51
  52 static void
  53 VmbusChannelOnOfferRescind(
  54         PVMBUS_CHANNEL_MESSAGE_HEADER hdr
  55         );
  56
  57 static void
  58 VmbusChannelOnGpadlCreated(
  59         PVMBUS_CHANNEL_MESSAGE_HEADER hdr
  60         );
  61
  62 static void
  63 VmbusChannelOnGpadlTorndown(
  64         PVMBUS_CHANNEL_MESSAGE_HEADER hdr
  65         );
  66
  67 static void
  68 VmbusChannelOnOffersDelivered(
  69         PVMBUS_CHANNEL_MESSAGE_HEADER hdr
  70         );
  71
  72 static void
  73 VmbusChannelOnVersionResponse(
  74         PVMBUS_CHANNEL_MESSAGE_HEADER hdr
  75         );
  76
  77 static void
  78 VmbusChannelProcessOffer(
  79         void * context
  80         );
  81
  82 static void
  83 VmbusChannelProcessRescindOffer(
  84         void * context
  85         );
  86
  87
  88 /* Globals */
  89
  90 #define MAX_NUM_DEVICE_CLASSES_SUPPORTED 4
  91
  92 static const struct hv_guid gSupportedDeviceClasses[MAX_NUM_DEVICE_CLASSES_SUPPORTED] = {
  93         /* {ba6163d9-04a1-4d29-b605-72e2ffb1dc7f} */
  94         /* Storage - SCSI */
  95         {
  96                 .data  = {
  97                         0xd9, 0x63, 0x61, 0xba, 0xa1, 0x04, 0x29, 0x4d,
  98                         0xb6, 0x05, 0x72, 0xe2, 0xff, 0xb1, 0xdc, 0x7f
  99                 }
 100         },
 101
 102         /* {F8615163-DF3E-46c5-913F-F2D2F965ED0E} */
 103         /* Network */
 104         {
 105                 .data = {
 106                         0x63, 0x51, 0x61, 0xF8, 0x3E, 0xDF, 0xc5, 0x46,
 107                         0x91, 0x3F, 0xF2, 0xD2, 0xF9, 0x65, 0xED, 0x0E
 108                 }
 109         },
 110
 111         /* {CFA8B69E-5B4A-4cc0-B98B-8BA1A1F3F95A} */
 112         /* Input */
 113         {
 114                 .data = {
 115                         0x9E, 0xB6, 0xA8, 0xCF, 0x4A, 0x5B, 0xc0, 0x4c,
 116                         0xB9, 0x8B, 0x8B, 0xA1, 0xA1, 0xF3, 0xF9, 0x5A
 117                 }
 118         },
 119
 120         /* {32412632-86cb-44a2-9b5c-50d1417354f5} */
 121         /* IDE */
 122         {
 123                 .data = {
 124                         0x32, 0x26, 0x41, 0x32, 0xcb, 0x86, 0xa2, 0x44,
 125                         0x9b, 0x5c, 0x50, 0xd1, 0x41, 0x73, 0x54, 0xf5
 126                 }
 127         },
 128 };
 129
 130 /* Channel message dispatch table */
 131 static VMBUS_CHANNEL_MESSAGE_TABLE_ENTRY gChannelMessageTable[ChannelMessageCount]= {
 132     {ChannelMessageInvalid,                                     NULL},
 133     {ChannelMessageOfferChannel,            VmbusChannelOnOffer},
 134     {ChannelMessageRescindChannelOffer,     VmbusChannelOnOfferRescind},
 135     {ChannelMessageRequestOffers,           NULL},
 136     {ChannelMessageAllOffersDelivered,      VmbusChannelOnOffersDelivered},
 137     {ChannelMessageOpenChannel,             NULL},
 138     {ChannelMessageOpenChannelResult,       VmbusChannelOnOpenResult},
 139     {ChannelMessageCloseChannel,            NULL},
 140     {ChannelMessageGpadlHeader,             NULL},
 141     {ChannelMessageGpadlBody,               NULL},
 142         {ChannelMessageGpadlCreated,                    VmbusChannelOnGpadlCreated},
 143     {ChannelMessageGpadlTeardown,           NULL},
 144     {ChannelMessageGpadlTorndown,           VmbusChannelOnGpadlTorndown},
 145     {ChannelMessageRelIdReleased,           NULL},
 146         {ChannelMessageInitiateContact,                 NULL},
 147         {ChannelMessageVersionResponse,                 VmbusChannelOnVersionResponse},
 148         {ChannelMessageUnload,                                  NULL},
 149 };
 150
 151 /*++
 152
 153 Name:
 154         AllocVmbusChannel()
 155
 156 Description:
 157         Allocate and initialize a vmbus channel object
 158
 159 --*/
 160 struct vmbus_channel *AllocVmbusChannel(void)
 161 {
 162         struct vmbus_channel *channel;
 163
 164         channel = kzalloc(sizeof(*channel), GFP_ATOMIC);
 165         if (!channel)
 166         {
 167                 return NULL;
 168         }
 169
 170         spin_lock_init(&channel->inbound_lock);
 171
 172         init_timer(&channel->poll_timer);
 173         channel->poll_timer.data = (unsigned long)channel;
 174         channel->poll_timer.function = VmbusChannelOnTimer;
 175
 176         /* channel->dataWorkQueue = WorkQueueCreate("data"); */
 177         channel->ControlWQ = create_workqueue("hv_vmbus_ctl");
 178         if (!channel->ControlWQ)
 179         {
 180                 kfree(channel);
 181                 return NULL;
 182         }
 183
 184         return channel;
 185 }
 186
 187 /*++
 188
 189 Name:
 190         ReleaseVmbusChannel()
 191
 192 Description:
 193         Release the vmbus channel object itself
 194
 195 --*/
 196 static inline void ReleaseVmbusChannel(void* Context)
 197 {
 198         struct vmbus_channel *channel = Context;
 199
 200         DPRINT_ENTER(VMBUS);
 201
 202         DPRINT_DBG(VMBUS, "releasing channel (%p)", channel);
 203         destroy_workqueue(channel->ControlWQ);
 204         DPRINT_DBG(VMBUS, "channel released (%p)", channel);
 205
 206         kfree(channel);
 207
 208         DPRINT_EXIT(VMBUS);
 209 }
 210
 211 /*++
 212
 213 Name:
 214         FreeVmbusChannel()
 215
 216 Description:
 217         Release the resources used by the vmbus channel object
 218
 219 --*/
 220 void FreeVmbusChannel(struct vmbus_channel *Channel)
 221 {
 222         del_timer(&Channel->poll_timer);
 223
 224         /* We have to release the channel's workqueue/thread in the vmbus's workqueue/thread context */
 225         /* ie we can't destroy ourselves. */
 226         osd_schedule_callback(gVmbusConnection.WorkQueue, ReleaseVmbusChannel,
 227                               (void *)Channel);
 228 }
 229
 230
 231 /*++
 232
 233 Name:
 234         VmbusChannelProcessOffer()
 235
 236 Description:
 237         Process the offer by creating a channel/device associated with this offer
 238
 239 --*/
 240 static void
 241 VmbusChannelProcessOffer(
 242         void * context
 243         )
 244 {
 245         int ret=0;
 246         struct vmbus_channel *newChannel = context;
 247         struct vmbus_channel *channel;
 248         LIST_ENTRY* anchor;
 249         LIST_ENTRY* curr;
 250         bool fNew = true;
 251         unsigned long flags;
 252
 253         DPRINT_ENTER(VMBUS);
 254
 255         /* Make sure this is a new offer */
 256         spin_lock_irqsave(&gVmbusConnection.channel_lock, flags);
 257
 258         ITERATE_LIST_ENTRIES(anchor, curr, &gVmbusConnection.ChannelList)
 259         {
 260                 channel = CONTAINING_RECORD(curr, struct vmbus_channel, ListEntry);
 261
 262                 if (!memcmp(&channel->OfferMsg.Offer.InterfaceType, &newChannel->OfferMsg.Offer.InterfaceType,sizeof(struct hv_guid)) &&
 263                         !memcmp(&channel->OfferMsg.Offer.InterfaceInstance, &newChannel->OfferMsg.Offer.InterfaceInstance, sizeof(struct hv_guid)))
 264                 {
 265                         fNew = false;
 266                         break;
 267                 }
 268         }
 269
 270         if (fNew)
 271         {
 272                 INSERT_TAIL_LIST(&gVmbusConnection.ChannelList, &newChannel->ListEntry);
 273         }
 274         spin_unlock_irqrestore(&gVmbusConnection.channel_lock, flags);
 275
 276         if (!fNew)
 277         {
 278                 DPRINT_DBG(VMBUS, "Ignoring duplicate offer for relid (%d)", newChannel->OfferMsg.ChildRelId);
 279                 FreeVmbusChannel(newChannel);
 280                 DPRINT_EXIT(VMBUS);
 281                 return;
 282         }
 283
 284         /* Start the process of binding this offer to the driver */
 285         /* We need to set the DeviceObject field before calling VmbusChildDeviceAdd() */
 286         newChannel->DeviceObject = VmbusChildDeviceCreate(
 287                 newChannel->OfferMsg.Offer.InterfaceType,
 288                 newChannel->OfferMsg.Offer.InterfaceInstance,
 289                 newChannel);
 290
 291         DPRINT_DBG(VMBUS, "child device object allocated - %p", newChannel->DeviceObject);
 292
 293         /*
 294          * Add the new device to the bus. This will kick off device-driver
 295          * binding which eventually invokes the device driver's AddDevice()
 296          * method.
 297          */
 298
 299         ret = VmbusChildDeviceAdd(newChannel->DeviceObject);
 300         if (ret != 0)
 301         {
 302                 DPRINT_ERR(VMBUS, "unable to add child device object (relid %d)",
 303                         newChannel->OfferMsg.ChildRelId);
 304
 305                 spin_lock_irqsave(&gVmbusConnection.channel_lock, flags);
 306                 REMOVE_ENTRY_LIST(&newChannel->ListEntry);
 307                 spin_unlock_irqrestore(&gVmbusConnection.channel_lock, flags);
 308
 309                 FreeVmbusChannel(newChannel);
 310         }
 311         else
 312         {
 313                 /*
 314                  * This state is used to indicate a successful open
 315                  * so that when we do close the channel normally, we
 316                  * can cleanup properly
 317                  */
 318                 newChannel->State = CHANNEL_OPEN_STATE;
 319         }
 320         DPRINT_EXIT(VMBUS);
 321 }
 322
 323 /*++
 324
 325 Name:
 326         VmbusChannelProcessRescindOffer()
 327
 328 Description:
 329         Rescind the offer by initiating a device removal
 330
 331 --*/
 332 static void
 333 VmbusChannelProcessRescindOffer(
 334         void * context
 335         )
 336 {
 337         struct vmbus_channel *channel = context;
 338
 339         DPRINT_ENTER(VMBUS);
 340
 341         VmbusChildDeviceRemove(channel->DeviceObject);
 342
 343         DPRINT_EXIT(VMBUS);
 344 }
 345
 346
 347 /*++
 348
 349 Name:
 350         VmbusChannelOnOffer()
 351
 352 Description:
 353         Handler for channel offers from vmbus in parent partition. We ignore all offers except
 354         network and storage offers. For each network and storage offers, we create a channel object
 355         and queue a work item to the channel object to process the offer synchronously
 356
 357 --*/
 358 static void
 359 VmbusChannelOnOffer(
 360         PVMBUS_CHANNEL_MESSAGE_HEADER hdr
 361         )
 362 {
 363         VMBUS_CHANNEL_OFFER_CHANNEL* offer = (VMBUS_CHANNEL_OFFER_CHANNEL*)hdr;
 364         struct vmbus_channel *newChannel;
 365
 366         struct hv_guid *guidType;
 367         struct hv_guid *guidInstance;
 368         int i;
 369         int fSupported=0;
 370
 371         DPRINT_ENTER(VMBUS);
 372
 373         for (i=0; i<MAX_NUM_DEVICE_CLASSES_SUPPORTED; i++)
 374         {
 375                 if (memcmp(&offer->Offer.InterfaceType, &gSupportedDeviceClasses[i], sizeof(struct hv_guid)) == 0)
 376                 {
 377                         fSupported = 1;
 378                         break;
 379                 }
 380         }
 381
 382         if (!fSupported)
 383         {
 384                 DPRINT_DBG(VMBUS, "Ignoring channel offer notification for child relid %d", offer->ChildRelId);
 385                 DPRINT_EXIT(VMBUS);
 386
 387                 return;
 388         }
 389
 390         guidType = &offer->Offer.InterfaceType;
 391         guidInstance = &offer->Offer.InterfaceInstance;
 392
 393         DPRINT_INFO(VMBUS, "Channel offer notification - child relid %d monitor id %d allocated %d, "
 394                 "type {%02x%02x%02x%02x-%02x%02x-%02x%02x-%02x%02x%02x%02x%02x%02x%02x%02x} "
 395                 "instance {%02x%02x%02x%02x-%02x%02x-%02x%02x-%02x%02x%02x%02x%02x%02x%02x%02x}",
 396                 offer->ChildRelId,
 397                 offer->MonitorId,
 398                 offer->MonitorAllocated,
 399                 guidType->data[3], guidType->data[2], guidType->data[1], guidType->data[0],
 400                 guidType->data[5], guidType->data[4], guidType->data[7], guidType->data[6],
 401                 guidType->data[8], guidType->data[9], guidType->data[10], guidType->data[11],
 402                 guidType->data[12], guidType->data[13], guidType->data[14], guidType->data[15],
 403                 guidInstance->data[3], guidInstance->data[2], guidInstance->data[1], guidInstance->data[0],
 404                 guidInstance->data[5], guidInstance->data[4], guidInstance->data[7], guidInstance->data[6],
 405                 guidInstance->data[8], guidInstance->data[9], guidInstance->data[10], guidInstance->data[11],
 406                 guidInstance->data[12], guidInstance->data[13], guidInstance->data[14], guidInstance->data[15]);
 407
 408         /* Allocate the channel object and save this offer. */
 409         newChannel = AllocVmbusChannel();
 410         if (!newChannel)
 411         {
 412                 DPRINT_ERR(VMBUS, "unable to allocate channel object");
 413                 return;
 414         }
 415
 416         DPRINT_DBG(VMBUS, "channel object allocated - %p", newChannel);
 417
 418         memcpy(&newChannel->OfferMsg, offer, sizeof(VMBUS_CHANNEL_OFFER_CHANNEL));
 419         newChannel->MonitorGroup = (u8)offer->MonitorId / 32;
 420         newChannel->MonitorBit = (u8)offer->MonitorId % 32;
 421
 422         /* TODO: Make sure the offer comes from our parent partition */
 423         osd_schedule_callback(newChannel->ControlWQ, VmbusChannelProcessOffer,
 424                               newChannel);
 425
 426         DPRINT_EXIT(VMBUS);
 427 }
 428
 429
 430 /*++
 431
 432 Name:
 433         VmbusChannelOnOfferRescind()
 434
 435 Description:
 436         Rescind offer handler. We queue a work item to process this offer
 437         synchronously
 438
 439 --*/
 440 static void
 441 VmbusChannelOnOfferRescind(
 442         PVMBUS_CHANNEL_MESSAGE_HEADER hdr
 443         )
 444 {
 445         VMBUS_CHANNEL_RESCIND_OFFER* rescind = (VMBUS_CHANNEL_RESCIND_OFFER*)hdr;
 446         struct vmbus_channel *channel;
 447
 448         DPRINT_ENTER(VMBUS);
 449
 450         channel = GetChannelFromRelId(rescind->ChildRelId);
 451         if (channel == NULL)
 452         {
 453                 DPRINT_DBG(VMBUS, "channel not found for relId %d", rescind->ChildRelId);
 454                 return;
 455         }
 456
 457         osd_schedule_callback(channel->ControlWQ,
 458                               VmbusChannelProcessRescindOffer,
 459                               channel);
 460
 461         DPRINT_EXIT(VMBUS);
 462 }
 463
 464
 465 /*++
 466
 467 Name:
 468         VmbusChannelOnOffersDelivered()
 469
 470 Description:
 471         This is invoked when all offers have been delivered.
 472         Nothing to do here.
 473
 474 --*/
 475 static void
 476 VmbusChannelOnOffersDelivered(
 477         PVMBUS_CHANNEL_MESSAGE_HEADER hdr
 478         )
 479 {
 480         DPRINT_ENTER(VMBUS);
 481         DPRINT_EXIT(VMBUS);
 482 }
 483
 484
 485 /*++
 486
 487 Name:
 488         VmbusChannelOnOpenResult()
 489
 490 Description:
 491         Open result handler. This is invoked when we received a response
 492         to our channel open request. Find the matching request, copy the
 493         response and signal the requesting thread.
 494
 495 --*/
 496 static void
 497 VmbusChannelOnOpenResult(
 498         PVMBUS_CHANNEL_MESSAGE_HEADER hdr
 499         )
 500 {
 501         VMBUS_CHANNEL_OPEN_RESULT* result = (VMBUS_CHANNEL_OPEN_RESULT*)hdr;
 502         LIST_ENTRY* anchor;
 503         LIST_ENTRY* curr;
 504         struct vmbus_channel_msginfo *msgInfo;
 505         VMBUS_CHANNEL_MESSAGE_HEADER* requestHeader;
 506         VMBUS_CHANNEL_OPEN_CHANNEL* openMsg;
 507         unsigned long flags;
 508
 509         DPRINT_ENTER(VMBUS);
 510
 511         DPRINT_DBG(VMBUS, "vmbus open result - %d", result->Status);
 512
 513         /* Find the open msg, copy the result and signal/unblock the wait event */
 514         spin_lock_irqsave(&gVmbusConnection.channelmsg_lock, flags);
 515
 516         ITERATE_LIST_ENTRIES(anchor, curr, &gVmbusConnection.ChannelMsgList)
 517         {
 518                 msgInfo = (struct vmbus_channel_msginfo *)curr;
 519                 requestHeader = (VMBUS_CHANNEL_MESSAGE_HEADER*)msgInfo->Msg;
 520
 521                 if (requestHeader->MessageType == ChannelMessageOpenChannel)
 522                 {
 523                         openMsg = (VMBUS_CHANNEL_OPEN_CHANNEL*)msgInfo->Msg;
 524                         if (openMsg->ChildRelId == result->ChildRelId &&
 525                                 openMsg->OpenId == result->OpenId)
 526                         {
 527                                 memcpy(&msgInfo->Response.OpenResult, result, sizeof(VMBUS_CHANNEL_OPEN_RESULT));
 528                                 osd_WaitEventSet(msgInfo->WaitEvent);
 529                                 break;
 530                         }
 531                 }
 532         }
 533         spin_unlock_irqrestore(&gVmbusConnection.channelmsg_lock, flags);
 534
 535         DPRINT_EXIT(VMBUS);
 536 }
 537
 538
 539 /*++
 540
 541 Name:
 542         VmbusChannelOnGpadlCreated()
 543
 544 Description:
 545         GPADL created handler. This is invoked when we received a response
 546         to our gpadl create request. Find the matching request, copy the
 547         response and signal the requesting thread.
 548
 549 --*/
 550 static void
 551 VmbusChannelOnGpadlCreated(
 552         PVMBUS_CHANNEL_MESSAGE_HEADER hdr
 553         )
 554 {
 555         VMBUS_CHANNEL_GPADL_CREATED *gpadlCreated = (VMBUS_CHANNEL_GPADL_CREATED*)hdr;
 556         LIST_ENTRY *anchor;
 557         LIST_ENTRY *curr;
 558         struct vmbus_channel_msginfo *msgInfo;
 559         VMBUS_CHANNEL_MESSAGE_HEADER *requestHeader;
 560         VMBUS_CHANNEL_GPADL_HEADER *gpadlHeader;
 561         unsigned long flags;
 562
 563         DPRINT_ENTER(VMBUS);
 564
 565         DPRINT_DBG(VMBUS, "vmbus gpadl created result - %d", gpadlCreated->CreationStatus);
 566
 567         /* Find the establish msg, copy the result and signal/unblock the wait event */
 568         spin_lock_irqsave(&gVmbusConnection.channelmsg_lock, flags);
 569
 570         ITERATE_LIST_ENTRIES(anchor, curr, &gVmbusConnection.ChannelMsgList)
 571         {
 572                 msgInfo = (struct vmbus_channel_msginfo *)curr;
 573                 requestHeader = (VMBUS_CHANNEL_MESSAGE_HEADER*)msgInfo->Msg;
 574
 575                 if (requestHeader->MessageType == ChannelMessageGpadlHeader)
 576                 {
 577                         gpadlHeader = (VMBUS_CHANNEL_GPADL_HEADER*)requestHeader;
 578
 579                         if ((gpadlCreated->ChildRelId == gpadlHeader->ChildRelId) &&
 580                                         (gpadlCreated->Gpadl == gpadlHeader->Gpadl))
 581                         {
 582                                 memcpy(&msgInfo->Response.GpadlCreated, gpadlCreated, sizeof(VMBUS_CHANNEL_GPADL_CREATED));
 583                                 osd_WaitEventSet(msgInfo->WaitEvent);
 584                                 break;
 585                         }
 586                 }
 587         }
 588         spin_unlock_irqrestore(&gVmbusConnection.channelmsg_lock, flags);
 589
 590         DPRINT_EXIT(VMBUS);
 591 }
 592
 593
 594 /*++
 595
 596 Name:
 597         VmbusChannelOnGpadlTorndown()
 598
 599 Description:
 600         GPADL torndown handler. This is invoked when we received a response
 601         to our gpadl teardown request. Find the matching request, copy the
 602         response and signal the requesting thread.
 603
 604 --*/
 605 static void
 606 VmbusChannelOnGpadlTorndown(
 607         PVMBUS_CHANNEL_MESSAGE_HEADER hdr
 608         )
 609 {
 610         VMBUS_CHANNEL_GPADL_TORNDOWN* gpadlTorndown  = (VMBUS_CHANNEL_GPADL_TORNDOWN*)hdr;
 611         LIST_ENTRY* anchor;
 612         LIST_ENTRY* curr;
 613         struct vmbus_channel_msginfo *msgInfo;
 614         VMBUS_CHANNEL_MESSAGE_HEADER *requestHeader;
 615         VMBUS_CHANNEL_GPADL_TEARDOWN *gpadlTeardown;
 616         unsigned long flags;
 617
 618         DPRINT_ENTER(VMBUS);
 619
 620         /* Find the open msg, copy the result and signal/unblock the wait event */
 621         spin_lock_irqsave(&gVmbusConnection.channelmsg_lock, flags);
 622
 623         ITERATE_LIST_ENTRIES(anchor, curr, &gVmbusConnection.ChannelMsgList)
 624         {
 625                 msgInfo = (struct vmbus_channel_msginfo *)curr;
 626                 requestHeader = (VMBUS_CHANNEL_MESSAGE_HEADER*)msgInfo->Msg;
 627
 628                 if (requestHeader->MessageType == ChannelMessageGpadlTeardown)
 629                 {
 630                         gpadlTeardown = (VMBUS_CHANNEL_GPADL_TEARDOWN*)requestHeader;
 631
 632                         if (gpadlTorndown->Gpadl == gpadlTeardown->Gpadl)
 633                         {
 634                                 memcpy(&msgInfo->Response.GpadlTorndown, gpadlTorndown, sizeof(VMBUS_CHANNEL_GPADL_TORNDOWN));
 635                                 osd_WaitEventSet(msgInfo->WaitEvent);
 636                                 break;
 637                         }
 638                 }
 639         }
 640         spin_unlock_irqrestore(&gVmbusConnection.channelmsg_lock, flags);
 641
 642         DPRINT_EXIT(VMBUS);
 643 }
 644
 645
 646 /*++
 647
 648 Name:
 649         VmbusChannelOnVersionResponse()
 650
 651 Description:
 652         Version response handler. This is invoked when we received a response
 653         to our initiate contact request. Find the matching request, copy the
 654         response and signal the requesting thread.
 655
 656 --*/
 657 static void
 658 VmbusChannelOnVersionResponse(
 659         PVMBUS_CHANNEL_MESSAGE_HEADER hdr
 660         )
 661 {
 662         LIST_ENTRY* anchor;
 663         LIST_ENTRY* curr;
 664         struct vmbus_channel_msginfo *msgInfo;
 665         VMBUS_CHANNEL_MESSAGE_HEADER *requestHeader;
 666         VMBUS_CHANNEL_INITIATE_CONTACT *initiate;
 667         VMBUS_CHANNEL_VERSION_RESPONSE *versionResponse  = (VMBUS_CHANNEL_VERSION_RESPONSE*)hdr;
 668         unsigned long flags;
 669
 670         DPRINT_ENTER(VMBUS);
 671
 672         spin_lock_irqsave(&gVmbusConnection.channelmsg_lock, flags);
 673
 674         ITERATE_LIST_ENTRIES(anchor, curr, &gVmbusConnection.ChannelMsgList)
 675         {
 676                 msgInfo = (struct vmbus_channel_msginfo *)curr;
 677                 requestHeader = (VMBUS_CHANNEL_MESSAGE_HEADER*)msgInfo->Msg;
 678
 679                 if (requestHeader->MessageType == ChannelMessageInitiateContact)
 680                 {
 681                         initiate = (VMBUS_CHANNEL_INITIATE_CONTACT*)requestHeader;
 682                         memcpy(&msgInfo->Response.VersionResponse, versionResponse, sizeof(VMBUS_CHANNEL_VERSION_RESPONSE));
 683                         osd_WaitEventSet(msgInfo->WaitEvent);
 684                 }
 685         }
 686         spin_unlock_irqrestore(&gVmbusConnection.channelmsg_lock, flags);
 687
 688         DPRINT_EXIT(VMBUS);
 689 }
 690
 691
 692 /*++
 693
 694 Name:
 695         VmbusOnChannelMessage()
 696
 697 Description:
 698         Handler for channel protocol messages.
 699         This is invoked in the vmbus worker thread context.
 700
 701 --*/
 702 void VmbusOnChannelMessage(void *Context)
 703 {
 704         HV_MESSAGE *msg=(HV_MESSAGE*)Context;
 705         VMBUS_CHANNEL_MESSAGE_HEADER* hdr;
 706         int size;
 707
 708         DPRINT_ENTER(VMBUS);
 709
 710         hdr = (VMBUS_CHANNEL_MESSAGE_HEADER*)msg->u.Payload;
 711         size=msg->Header.PayloadSize;
 712
 713         DPRINT_DBG(VMBUS, "message type %d size %d", hdr->MessageType, size);
 714
 715         if (hdr->MessageType >= ChannelMessageCount)
 716         {
 717                 DPRINT_ERR(VMBUS, "Received invalid channel message type %d size %d", hdr->MessageType, size);
 718                 print_hex_dump_bytes("", DUMP_PREFIX_NONE,
 719                                      (unsigned char *)msg->u.Payload, size);
 720                 kfree(msg);
 721                 return;
 722         }
 723
 724         if (gChannelMessageTable[hdr->MessageType].messageHandler)
 725         {
 726                 gChannelMessageTable[hdr->MessageType].messageHandler(hdr);
 727         }
 728         else
 729         {
 730                 DPRINT_ERR(VMBUS, "Unhandled channel message type %d", hdr->MessageType);
 731         }
 732
 733         /* Free the msg that was allocated in VmbusOnMsgDPC() */
 734         kfree(msg);
 735         DPRINT_EXIT(VMBUS);
 736 }
 737
 738
 739 /*++
 740
 741 Name:
 742         VmbusChannelRequestOffers()
 743
 744 Description:
 745         Send a request to get all our pending offers.
 746
 747 --*/
 748 int VmbusChannelRequestOffers(void)
 749 {
 750         int ret=0;
 751         VMBUS_CHANNEL_MESSAGE_HEADER* msg;
 752         struct vmbus_channel_msginfo *msgInfo;
 753
 754         DPRINT_ENTER(VMBUS);
 755
 756         msgInfo = kmalloc(sizeof(*msgInfo) + sizeof(VMBUS_CHANNEL_MESSAGE_HEADER), GFP_KERNEL);
 757         ASSERT(msgInfo != NULL);
 758
 759         msgInfo->WaitEvent = osd_WaitEventCreate();
 760         msg = (VMBUS_CHANNEL_MESSAGE_HEADER*)msgInfo->Msg;
 761
 762         msg->MessageType = ChannelMessageRequestOffers;
 763
 764         /*SpinlockAcquire(gVmbusConnection.channelMsgLock);
 765         INSERT_TAIL_LIST(&gVmbusConnection.channelMsgList, &msgInfo->msgListEntry);
 766         SpinlockRelease(gVmbusConnection.channelMsgLock);*/
 767
 768         ret = VmbusPostMessage(msg, sizeof(VMBUS_CHANNEL_MESSAGE_HEADER));
 769         if (ret != 0)
 770         {
 771                 DPRINT_ERR(VMBUS, "Unable to request offers - %d", ret);
 772
 773                 /*SpinlockAcquire(gVmbusConnection.channelMsgLock);
 774                 REMOVE_ENTRY_LIST(&msgInfo->msgListEntry);
 775                 SpinlockRelease(gVmbusConnection.channelMsgLock);*/
 776
 777                 goto Cleanup;
 778         }
 779         /* osd_WaitEventWait(msgInfo->waitEvent); */
 780
 781         /*SpinlockAcquire(gVmbusConnection.channelMsgLock);
 782         REMOVE_ENTRY_LIST(&msgInfo->msgListEntry);
 783         SpinlockRelease(gVmbusConnection.channelMsgLock);*/
 784
 785
 786 Cleanup:
 787         if (msgInfo)
 788         {
 789                 kfree(msgInfo->WaitEvent);
 790                 kfree(msgInfo);
 791         }
 792
 793         DPRINT_EXIT(VMBUS);
 794
 795         return ret;
 796 }
 797
 798 /*++
 799
 800 Name:
 801         VmbusChannelReleaseUnattachedChannels()
 802
 803 Description:
 804         Release channels that are unattached/unconnected ie (no drivers associated)
 805
 806 --*/
 807 void VmbusChannelReleaseUnattachedChannels(void)
 808 {
 809         LIST_ENTRY *entry;
 810         struct vmbus_channel *channel;
 811         struct vmbus_channel *start = NULL;
 812         unsigned long flags;
 813
 814         spin_lock_irqsave(&gVmbusConnection.channel_lock, flags);
 815
 816         while (!IsListEmpty(&gVmbusConnection.ChannelList))
 817         {
 818                 entry = TOP_LIST_ENTRY(&gVmbusConnection.ChannelList);
 819                 channel = CONTAINING_RECORD(entry, struct vmbus_channel, ListEntry);
 820
 821                 if (channel == start)
 822                         break;
 823
 824                 if (!channel->DeviceObject->Driver)
 825                 {
 826                         REMOVE_ENTRY_LIST(&channel->ListEntry);
 827                         DPRINT_INFO(VMBUS, "Releasing unattached device object %p", channel->DeviceObject);
 828
 829                         VmbusChildDeviceRemove(channel->DeviceObject);
 830                         FreeVmbusChannel(channel);
 831                 }
 832                 else
 833                 {
 834                         if (!start)
 835                         {
 836                                 start = channel;
 837                         }
 838                 }
 839         }
 840
 841         spin_unlock_irqrestore(&gVmbusConnection.channel_lock, flags);
 842 }
 843
 844 /* eof */